The RAM-202-24-202U powder-coated, marine-grade aluminum Humminbird Helix 7 mount consists of a medium length double socket arm, a 2.5″ diameter round base with a 1.5″ C size ball, and one 1.5″ x 3.5″ rectangular plate with a 1.5″ C size ball. The 1.5″ x 3.5″ rectangular plate contains a 4-hole pattern. Rubber ball and socket technology provides shock and vibration damping, and allows for near-infinite adjustability so you can position your device at the perfect viewing angle. Compatible with the Humminbird Helix 7.